EM-2070

Triangles, quadrilaterals and polygons

E Math · Secondary 4 · Hard · Triangles, quadrilaterals and polygons

A regular polygon has some of its sides covered. Two adjacent interior angles that can be seen are

x^\circ

and

y^\circ

, and

x + y = 90^\circ

. The polygon is regular.

Find the number of sides of the polygon.

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